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Korea 2000 coordinate system is the national plane coordinate system adopted by Korea in 2002. It is based on ITRF97 framework and GRS80 ellipsoid and adopts transverse Mercator projection (central meridian 127°E). It replaced the old Tokyo coordinate system and is compatible with global satellite positioning systems (such as GPS). It has higher accuracy and is widely used in Korea's land surveying and engineering construction.

DGN95 (Datum Geodesi Nasional 1995) is a geographic coordinate reference system officially adopted by the Indonesian government in 1995 and is used as the surveying and geographic information infrastructure throughout Indonesia. Its EPSG code is designated as 4755 and was designed to suit Indonesia's geographic characteristics and geodetic requirements. DGN95 is based on the international geodetic standard ITRF1992 (International Terrestrial Reference Frame 1992) and is the national standard to ensure uniformity in surveying and highly accurate location information.

NZGD2000 (New Zealand Geodetic Datum 2000) is the New Zealand 2000 geodetic datum, which is the current national geodetic coordinate system of New Zealand. It is used to define the reference framework of the country's geospatial data and plays an important role in surveying and mapping, geographic information, engineering and other fields.

**Amersfoort (EPSG:4289) **is a widely used geographic coordinate system in the Netherlands, using Bessel 1841 as the base ellipsoid, with the geodetic base point at Amersfoort. This coordinate system has long played an important role in land surveying, mapping, and infrastructure development in the Netherlands. EPSG:4289 uses geographic coordinates (latitude and longitude), making it suitable for expressing wide-area location information on the Earth’s surface.

CH1903 is the widely used national coordinate system of Switzerland, based on the geodetic datum established in 1903. It is a projection coordinate system covering the whole of Switzerland, developed to enable precise geospatial information management and mapping of a country with mountainous terrain. The reference ellipsoid used is Bessel 1841, and the projection method is the Oblique Mercator Projection. This coordinate system has long been used by the Swiss National Cartographic Office (Swisstopo) and has become a standard in many fields such as topographic mapping, surveying, civil engineering and infrastructure planning. In recent years, Switzerland has gradually transitioned to the higher-precision CH1903+ (EPSG:2056) coordinate system, but a large amount of historical data is still stored based on CH1903.

**SIRGAS 2000 **is a geocentric reference frame for Central and South America, which aims to define and implement a unified reference frame for Central and South America that is consistent with ITRF. Its ellipsoid adopts GRS 1980, with a major semi-axis of 6378137 meters, an oblateness of 298.257222101, the Greenwich meridian as the prime meridian, and the angle unit is degree. SIRGAS 2000 was established in 2000, consistent with the ITRF2000 framework, with a reference epoch of 2000.0. It is a regional encryption of ITRS in South America, achieved through a network of about 200 continuously operating stations (SIRGAS-CON) throughout Latin America and the Caribbean.

MGI coordinate system was established by the Austrian Military Geographical Institute. It is a local coordinate system based on the Bessel ellipsoid and is mainly used for geographic information representation and spatial positioning in Austria. It uses the Transverse Mercator projection, with the central meridian at 13°20′ east longitude, the latitude of the projection origin at 0°, the easting offset of 1,500,000 meters, and the northing offset of 0 meters. It is a variant of the Gauss-Krüger projection and is widely used in Austria in many fields such as topographic mapping, land management, urban planning, and transportation planning, providing an accurate spatial reference frame for these fields.

RD New (Rijksdriehoeksmeting New) is the national reference coordinate system of the Netherlands and the standard projection coordinate system for geographic information measurement and map production. The coordinate system is based on the Transverse Mercator Projection, with Amersfoort as the origin. It is widely known as EPSG code 28992. The system is designed to manage spatial data throughout the Netherlands with high accuracy and is currently widely used in public and private fields such as land management, urban planning, infrastructure design, and disaster response.

OSGB36 is the UK national coordinate system, the full name is Ordnance Survey Great Britain 1936, and its EPSG code is 4277. This coordinate system is based on the Airy 1830 ellipsoid and was developed by the Ordnance Survey of the United Kingdom. It is the national datum for topographic surveying in the United Kingdom. In the fields of geographic information systems (GIS), cartography, and engineering surveying in the United Kingdom, OSGB36 has been widely used, providing a unified reference framework for geospatial data in the United Kingdom, allowing geographic data from different sources to be integrated and analyzed in the same coordinate system.

JGD2000 is the national surveying system of Japan officially adopted by the Geospatial Information Authority of Japan in April 2002, replacing the previous “Tokyo Datum”. The main purpose of its introduction is to enhance the coordination with the global GPS coordinate system. JGD2000 is based on the geocentric coordinate system (ITRF: International Terrestrial Reference Frame) with the center of the earth as the origin, thus achieving higher-precision measurement and GIS analysis capabilities.